To provide a hydraulic strut mounting assembly in which a ride quality of a vehicle is further improved, by reinforcing buffering capability of a shock absorber and a coil spring by hydraulic pressure, when a stronger vibration than that of a certain level is generated in the vehicle.

The hydraulic strut mounting assembly comprises the strut mount coupled to the shock absorber, a decoupler provided across an interior space of the strut mount, an upper and lower chambers formed in the strut mount formed by the decoupler, an orifice communicating the upper chamber with the lower chamber, a predetermined liquid which the lower chamber is filled with, and a plunger for pressurizing the fluid in line with the shock absorber when the vibration is generated.